1138308691 has 8 divisors (see below), whose sum is σ = 1237118960. Its totient is φ = 1041105312.

The previous prime is 1138308679. The next prime is 1138308701. The reversal of 1138308691 is 1968038311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1138308691 - 2¹¹ = 1138306643 is a prime.

It is a super-2 number, since 2×1138308691² = 2591493352012266962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138308631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400245 + ... + 403078.

It is an arithmetic number, because the mean of its divisors is an integer number (154639870).

Almost surely, 2^1138308691 is an apocalyptic number.

1138308691 is a deficient number, since it is larger than the sum of its proper divisors (98810269).

1138308691 is a wasteful number, since it uses less digits than its factorization.

1138308691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803445.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1138308691 is about 33738.8306110333. The cubic root of 1138308691 is about 1044.1270583580.

The spelling of 1138308691 in words is "one billion, one hundred thirty-eight million, three hundred eight thousand, six hundred ninety-one".